Definition of complexity noun from the Oxford Advanced Learner's Dictionary

      

    complexity

     noun
    noun
    BrE BrE//kəmˈpleksəti//
     
    ; NAmE NAmE//kəmˈpleksəti//
     
     
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  1. 1[uncountable] the state of being formed of many parts; the state of being difficult to understand the increasing complexity of modern telecommunication systems I was astonished by the size and complexity of the problem.
  2. 2complexities [plural] the features of a problem or situation that are difficult to understand the complexities of the system
  3. Extra examples Only now did he understand the full complexity of the problem. The author has managed to capture the complexity of this man. The critics failed to understand the structural complexities of the novel’s language. The video emphasizes the complexity of this debate. These programs create additional complexities to the pricing system. a love story which explores the complexities of emotional infidelity a pay system of unnecessary complexity the linguistic complexity of Siberia
See the Oxford Advanced American Dictionary entry: complexity